Selkirk 200250 URSA Universal Roof Support Kit, 5" - 8" Dia Flexible roof support designed to fit 5&#44; 6&#44; 7&#44; and 8 in. diameter chimney The heavy duty band allows you to slide the length vertically to properly position this section in the Universal - Galvanized Dimension - 4 x 7.5 x 25 in